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Evaluation of Atmospheric Temperature Profiling off a Building Side in the Early Morning Hours

Evaluation of Atmospheric Temperature Profiling off a Building Side in the Early Morning Hours. Ryan Brown Department of Marine and Environmental Systems Florida Institute of Technology Melbourne, Florida 32901 July 20, 2005. Temperature Profiling. Why are we doing this?

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Evaluation of Atmospheric Temperature Profiling off a Building Side in the Early Morning Hours

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  1. Evaluation of Atmospheric Temperature Profiling off a Building Side in the Early Morning Hours Ryan Brown Department of Marine and Environmental Systems Florida Institute of Technology Melbourne, Florida 32901 July 20, 2005

  2. Temperature Profiling • Why are we doing this? • How the data was collected • Results • Conclusions

  3. Why are we Doing This? • To locate the Nocturnal Boundary Layer (NBL) • To obtain a low level temperature profile http://lidar.ssec.wisc.edu/papers/akp_thes/node6.htm

  4. What is the NBL? • AMS def.- The cool layer of air adjacent to the ground that forms at night. • Forms from radiative cooling and surface friction • Can extend for a few hundred meters • Interacting processes can occur within the stable NBL • Patchy sporadic turbulence • Internal gravity waves • Drainage flows • Inertial oscillations • Nocturnal jets

  5. What is a Sounding Profile? • A temperature analysis of the atmosphere above one particular spot on the surface • A measures the atmospheric and dew point temperatures http://weather.admin.niu.edu/cgi-bin/getmodel

  6. Measuring the Temperature www.fit.edu

  7. Height Depth 22.5 m 2.5 m 20 m 5 m 15 m 10 m 10 m 15 m 5 m 20 m 2.5 m 22.5 m

  8. Measuring the Temperature

  9. Measuring the Temperature • A temperature probe was lowered from the top of the building to the bottom • Connected to a laptop on the ground • Two types of runs • Slow, with 1 minute at each depth • Fast, from top to bottom without stopping

  10. June 8 4 total runs 3 slow 1 fast June 9 8 total runs 2 slow 6 fast Simulations Fast Runs What the profile should be without lag Equation based on Newtonian cooling ΔT= Lapse Rate * Velocity * Time + Tempo Measuring the Temperature

  11. A Glance at Real Time Data • Temperature fluctuates ±.035 degrees per second Beginning of Run End of Run Bottom of Building

  12. Temperature Graph From the Morning of June 8

  13. Fast Run Occurred from 0715 to 0723 Increasing Temp. the whole time The Fast Run of June 8

  14. A Look at the Fast Run Without Lag

  15. Temperature Graph from the Morning of June 9

  16. Fast runs for the morning of June 9

  17. Taking a Closer Look at Fast Run 2

  18. A Look at Run 2 Without Lag

  19. Conclusions • Temperature Inversion • The Crawford building was underneath the NBL • The Summer months in FL is not the best time to Search for the NBL due to little radiative cooling • NBL is not shallow

  20. Acknowledgements • All Field Project Researchers • Mike Splitt • Pearl Program for Simulations

  21. Questions? Arlena Moses

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